Samuel Hunter Christie Invented The Diamond Method For Circuits

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Introduction In the 19th century, Samuel Hunter Christie invented the diamond method for circuits, the initial idea to the Wheatstone bridge. However, bridge circuits, circuits with parallel resistors, bridged by a branch between them, were used to measure small voltages; but, the Wheatstone bridge is used to measure an unknown resistance using all the others three known resistance in the circuit. During the lab, the Wheatstone Bridge concept for a bridge circuit was used to determine the unknown resistor in the circuit, see in figure 1. The objective was to measure the voltages between points on the branch between the first two resistors in series on top and bottom ones, in which were connected in parallel. Thereafter, test the voltage calculated at different temperatures, those being room temperature, ice water and hot water; by using a thermistor in the circuit, that helps calibrate the Wheatstone bridge as a thermometer.
Firstly, the protoboard was powered with 1 volts coming from the power supply. The circuit was assembled by connecting two resistors in series on top and one resistor and the thermistor in series on the bottom connected to the top branch in parallel. The left end of the circuit was powered by 1 v from the power supply and the rightmost end was grounded. The thermistor was placed on the bottom branch of the circuit by two wires that connected to the protoboard and to the thermistor in which were long enough to allow the thermistor to be

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